EP2095135B1 - Capteur optique de tension - Google Patents

Capteur optique de tension Download PDF

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Publication number
EP2095135B1
EP2095135B1 EP06817784.9A EP06817784A EP2095135B1 EP 2095135 B1 EP2095135 B1 EP 2095135B1 EP 06817784 A EP06817784 A EP 06817784A EP 2095135 B1 EP2095135 B1 EP 2095135B1
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EP
European Patent Office
Prior art keywords
fiber
sensing
sensing element
voltage sensor
faraday rotator
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EP06817784.9A
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German (de)
English (en)
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EP2095135A1 (fr
Inventor
Klaus Bohnert
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ABB Research Ltd Switzerland
ABB Research Ltd Sweden
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ABB Research Ltd Switzerland
ABB Research Ltd Sweden
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
    • G01R15/14—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks
    • G01R15/24—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using light-modulating devices
    • G01R15/247—Details of the circuitry or construction of devices covered by G01R15/241 - G01R15/246
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
    • G01R15/14—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks
    • G01R15/24—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using light-modulating devices
    • G01R15/241—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using light-modulating devices using electro-optical modulators, e.g. electro-absorption
    • G01R15/242—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using light-modulating devices using electro-optical modulators, e.g. electro-absorption based on the Pockels effect, i.e. linear electro-optic effect
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
    • G01R15/14—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks
    • G01R15/24—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using light-modulating devices
    • G01R15/248—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using light-modulating devices using a constant light source and electro-mechanically driven deflectors

Definitions

  • the present invention relates to an optical voltage sensor having at least one elongate optical sensing element, such as an optical fiber, and a control unit.
  • the sensing element is capable of carrying at least a first and a second mode of light, which are orthogonally polarized.
  • the sensing element is designed in such a manner that the birefringence between the two modes depends on the electric voltage to be measured.
  • the control unit is adapted to generate light for the two modes in the sensing element and to measure the phase delay between the two modes.
  • Some known optical voltage measurement techniques such as described in EP 316 619 , EP 316 635 and Ref. 2 and 3, rely on the piezoelectric effect.
  • a field-induced mechanical change in a piezoelectric material leads to stress in an optical sensing element (such as a fiber) mechanically coupled to the piezoelectric material.
  • the stress in turn leads to a voltage-induced change of birefringence in the sensing element, which can be detected optically.
  • a measurement of the phase delay (or a change thereof) between two orthogonally polarized light waves allows to measure the electric field strength, or, more accurately, the integral of the same along the path of the light.
  • the invention starts from US 6,122,415 A , which discloses an electro-optic voltage sensor using either a Faraday rotator sandwiched between quarter-wave plates or a phase modulator providing a bias modulation of the birefringence between the two axes of polarization of light medium in the modulator.
  • the problem to be solved by the present invention is to provide a voltage sensor of the type above, in particular for measuring high voltages in the order of 10 kV or more, that allows an expedient, accurate and standardized measurement.
  • the invention is based on the realization that the addition of a Faraday rotator between the control unit and the sensing element allows to convert the behavior of the electro-optic measuring element and its associated components to the one of a conventional magneto-optical current sensor, which in turn allows to use the advanced control units and measuring techniques developed for optical current sensors.
  • magneto-optical sensors such as the one of EP 1 154 278 and Ref. 6 and 7, employ control units that generate a first pair of linearly polarized light waves with orthogonal polarizations and send it to the sensing equipment, which returns the light waves as a second pair of linearly polarized light waves, again with orthogonal but swapped polarization directions, and the phase shift between the light waves of the second pair being a function of the current to be measured.
  • control unit of the present invention can generate a first pair of linearly polarized light waves and send it to the sensing equipment, which (with the help of the Faraday rotator) returns the light waves as a second pair of linearly polarized light waves, with both light waves being orthogonally polarized and the phase shift between the light waves of the second pair being a function of the voltage or electric field to be measured.
  • the voltage sensor comprises at least a first and a second sensing element arranged in series.
  • the sensing elements are coupled to each other in such a manner that light traveling under the first mode of propagation in the first sensing element is coupled into the second mode of the second sensing element, and vice versa.
  • this design allows to compensate for a series of undesired effects and to reduce the roundtrip path imbalance of the waves to near zero, thereby allowing interference-based measurements even when using a low coherence light source.
  • a low coherence light source i.e. a light source having a coherence length in the sub-millimeter range (preferably ⁇ 0.1 mm), is advantageous because light waves generated by polarization cross coupling, e.g. at the fiber splices, interfere incoherently and thus do not deteriorate the sensor performance.
  • the voltage sensor is advantageously based on piezoelectric or electro-optic effects, see EP 316 635 , EP 316 619 , and Ref 2 and 3.
  • a piezoelectric sensor comprises a piezoelectric element with the sensing element mechanically mounted thereto such that a change of the voltage generates a stress-induced change of birefringence.
  • the sensing element(s) of an electro-optic sensor can be made of an electro-optic material the birefringence of which changes linearly in the presence of an electric field, such as a material showing a sufficiently strong Pockels effect.
  • sensing element can designate a waveguide, in particular an optical fiber, advantageously having a cross section comparable to the lateral extension of the light field.
  • the waveguide is polarization maintaining and supports a single spatial mode. The mode can be excited with two orthogonal directions of polarization.
  • sensing element can also designate an element that has a cross section larger than the lateral extension of the optical light field, in which case the (collimated) light beam propagates substantially freely, i.e. unguided, through the element.
  • mode designates a waveguide mode if the sensing element is used as a waveguide. It designates a linearly polarizated light beam that propagates through the sensing element unguided substantially without changing its state of polarization if the sensing element is not used as a wave guide.
  • Fig. 1 shows a fiber-optic voltage sensor having a control unit 1 and two sensing elements 2 using a piezo-electrically induced birefringence change.
  • Control unit 1 comprises a light source 3, a phase modulator 4 for a non-reciprocal phase modulation, a light detector 5, a signal processor 6, and a polarization maintaining fiber coupler 7.
  • Control unit 1 and the sensing elements 2 form a polarization-rotated reflection interferometer and use an interrogation technique as known from fiber gyroscopes, for details see Ref. [5, 4].
  • Two orthogonal linearly polarized light waves exit from control unit 1 and travel through a polarization maintaining (pm) feed fiber 8 (e.g. an elliptical-core fiber) to a Faraday rotator 9 with a rotation angle of 45° per pass (or, equivalently, a rotation angle of 45° + k ⁇ 90° with k being any integer number).
  • a polarization maintaining (pm) feed fiber 8 e.g. an elliptical-core fiber
  • a rotation angle of 45° per pass or, equivalently, a rotation angle of 45° + k ⁇ 90° with k being any integer number.
  • each light wave is rotated by 45° each time it passes through Faraday rotator 9.
  • the rotation is non-reciprocal, i.e.
  • the rotation as seen from an observer looking towards the light beam is, for example, clockwise if the beam propagates from left to right, but counter-clockwise if the beam propagates from right to left.
  • the total rotation is thus 90° (or 90° + k ⁇ 180° with k being an integer number).
  • the light waves exiting from Faraday rotator 9 are coupled into a first pm sensing fiber 10a.
  • the fast and slow axes of this sensing fiber are oriented at 45° with regard to the axes of the pm feed fiber 8 left of the rotator 9.
  • the polarization directions after the rotation again coincide with the birefingent fiber axes.
  • a second identical pm sensing fiber 10b is spliced at a splice 12 with its axes rotated by 90° with respect to first sensing fiber 10a.
  • the waves polarized parallel to slow axis in first fiber 10a are then polarized along the fast axis in second fiber 10b and vice versa.
  • the waves are reflected at the end of second fiber 10b by a mirror 15 and then retrace their paths.
  • Non-reciprocal Faraday rotator 9 introduces another 45° rotation that adds to the first rotation. The total rotation on the way forward and backward is thus 90°, i.e. the light waves again return with swapped polarizations to control unit 1, as in the current sensor of EP 1 154 278 .
  • the two sensing fibers 10a, 10b to the right of Faraday rotator 9 act as strain sensors and are used to measure the periodic piezo-electric deformation of piezoelectric quartz transducer elements 11a, 11b under the influence of an alternating electric field (see below).
  • the induced fiber strain causes a differential phase shift between the two orthogonal waves.
  • the two transducer elements 11a, 11b are arranged anti-parallel to each other, i.e. their polar axes x (2-fold crystal axis of quartz) are anti-parallel as shown in Fig. 1 .
  • the phase shifts in the sensing fibers are then of the same sign if the electric field directions E are the same (as indicated).
  • the polarization-maintaining fibers are elliptical-core fibers, so-called Panda or bowtie fibers, fibers with inner elliptical cladding, micro-structured fibers or other types of pm fiber [8, 9].
  • the effective sensitivity of the two pm sensing fibers 10a, 10b to alternating strain varies as a function of the time delay between the forward and backward propagating waves at the location of the strain-applying transducer elements 11a, 11b and thus as a function of the length of the fibers.
  • the strain-induced phase shift is at its maximum if the time delay is negligible compared to the period of the alternating strain and becomes zero if the delay corresponds to half a period of the strain.
  • the effective sensitivities of two sensing fibers 10a, 10b will differ if the delay is not negligible. However, for the case considered below - a strain periodicity of 50 or 60 Hz and fiber lengths up to some meters - the time delay is negligible and the delay effects can be disregarded.
  • Fig. 2 shows a modification of the set-up in Fig. 1 .
  • a pm fiber coupler 13 and the two pm sensing fibers 10a, 10b form a loop mirror.
  • the coupler end at Faraday rotator 9 is oriented like first sensing fiber 10a section in Fig. 1 .
  • the loop contains two 90°-splices 12, 14.
  • the splices divide the loop in two halves with identical lengths. An extra reflector is not needed.
  • the functions of the two loop halves are the same as the ones of the two sensing fibers 10a, 10b in Fig. 1 .
  • phase shifts in the fibers 10a, 10b add if the crystallographic x-directions and the field directions E are as indicated in Fig. 2 .
  • a potential advantage of this configuration is that for a symmetric arrangement of the transducer elements 11a, 11b the effective sensitivities are always the same independent of the time delay (but the sensitivities again decrease with increasing delay).
  • the phase modulator 4 in Figs. 1 and 2 is an integrated-optics lithium modulator, see e.g. Ref. [4].
  • the modulator also acts as a polarizer.
  • Another alternative is a piezoelectric modulator as illustrated in Ref [5].
  • Fig. 3 shows the same configuration as Fig. 1 but with a different type of integrated-optics phase modulator 4.
  • the modulator is a birefringence modulator which directly modulates the phase of orthogonal light waves.
  • the pm coupler 7 of Fig. 2 is then no longer needed.
  • the depolarized light from light source 3 (depolarizer not shown) is polarized in a fiber polarizer 21 and subsequently coupled into an entrance pm fiber lead 22 of the modulator at splice 23.
  • the polarization direction is at 45° to the axes of the pm fiber lead (45° splice).
  • the fast and slow axes of both pm fiber leads 22, 8 of modulator 4 are parallel to the electro-optic axes of the modulator.
  • a piezoelectric modulator as illustrated in Ref. 6 may be used as a birefringence modulator.
  • Fig. 4 shows a comparative implementation based on a Sagnac type interferometer using two Faraday rotators 9.
  • the orientation of the fiber cores at the rotators 9 is as above.
  • the sensing fibers are both rotated in the same direction, i.e. both clockwise or both counter-clockwise, with regard to the planes of polarization of the forward traveling waves between modulator 4 and the rotators 9.
  • the phase shifts in the fibers 10a, 10b add if the crystallographic x-directions and the field directions E are as indicated in Fig. 4 .
  • Figs. 5 and 6 show an arrangement of a piezo-optic voltage sensor of the type of Figs. 1 - 4 for a line integration of the electric field according to the present invention. Only the field sensing part of the sensor is shown, i.e. the two pm sensing fibers 10a, 10b and the transducer elements 11a, 11b.
  • the transducer elements 11a, 11b are preferably identical quartz beams (or platelets), according to Ref. 2.
  • two transducer elements are assigned to each sensing fiber 10a, 10b. They may be arranged between ground and high-voltage potentials with (equidistant), non-negligible spacing between them or they can form an essentially continuous quartz bridge as shown in Fig. 5 .
  • the beams may have a length of e.g. 200 mm and a cross-section of e.g. 2x2 mm 2 .
  • the measurement of e.g. 245 kV in high voltage substations may require 10-12 of such quartzes.
  • the longitudinal axis of the beams and the direction of the fiber coincide with a crystallographic x-direction (2-fold crystal axis). Quartz is a preferred material for the piezo-electric transducers due to its superior material properties. Others appropriate materials are given in Ref. 1, 2.
  • the two sensing fibers 10a, 10b are preferably attached to the transducer elements 11a, 11b with the 90°-splice 12 at half the distance between ground and high-voltage (Faraday rotator and mirror).
  • the optical phase shifts of the two fiber sections caused by the thermal expansion of the quartzes are then the same and cancel each other.
  • the x-directions (or polar directions) of the quartzes of a given sensing fiber point in the same direction.
  • the x-directions along the second sensing fiber 10b are anti-parallel to the x-directions along the first sensing fiber 10a.
  • the sign of the optical phase shifts at increasing or decreasing field strength is then the same at all transducer elements as required for the line integration of the field:
  • the field-induced piezoelectric strains at the two sensing fibers have opposite sign due to the anti-parallel crystal directions; the two sensing fibers react to a given change in strain also with opposite sign due to the 90° splice; as a result the combined effects have the same sign.
  • the overall phase shift is a measure for the line integral of the field and thus the voltage.
  • a further benefit of the arrangement is that optical phase shifts caused by external common-mode mechanical perturbations such as vibrations cancel each other.
  • the sensing fibers 10a, 10b have a coating which transmits, over a wide temperature range, typically -40 to 85°C, the entire piezoelectric strain from the quartzes to the sensing fibers (for example a thin polyimide coating or coating of diamond like carbon (DLC)).
  • the sensing fibers are preferably attached to the quartzes with some extensional pre-strain. The pre-strain is sufficiently large so that sufficient strain is still maintained when the quartzes contract at low temperatures.
  • the sensing fibers may be mounted to the quartz surface or to a groove 16 in the surface with an appropriate bonding material. Alternatively, the fiber may be attached in a through-hole along x.
  • the series of quartzes may be attached to a common support structure 17 such as a strip of fiber reenforced epoxy.
  • the strip may be mounted for mechanical protection in a tube, cable or another enclosure (not shown in Figs. 5, 6 ).
  • Figs. 7 and 8 show another arrangement wherein the sensing elements 2 or sensing fibers 10a, 10b are arranged side by side and optically coupled by a 90° splice 12 at neighboring ends 18a, 18b.
  • the set-up comprises two parallel series of piezoelectric transducer elements 11a, 11b with axis directions x and a fiber arrangement as indicated.
  • the neighboring transducer elements 11a and 11b are mounted to a common support structure 17 as shown in Fig. 8 .
  • Advantages of this arrangement are the following: (i) The sensitivity (optical phase shift per voltage change) is doubled compared to Fig. 5 . (ii) Vibration-induced phase changes are cancelled more completely since the two quartz series are very close to each other. Short wavelength vibrations are still common-mode.
  • Electro-optic voltage sensors are Electro-optic voltage sensors:
  • Fig. 9 shows an electro-optic voltage sensor according to the present invention.
  • the first and second sensing fibers 10a, 10b and the piezoelectric transducer elements 11a, 11b of Fig. 1 are replaced by an electro-optic crystal 19.
  • a collimator 20 between 45° Faraday rotator 9 and crystal 19 generates a collimated beam which is launched into crystal 19.
  • the beam double passes crystal 19 and is then coupled back into feed fiber 8. Due to the 45°-rotator 9 the light waves again return with swapped polarizations.
  • crystal 19 is suitable to line integration of the electric field.
  • Appropriate crystal classes and crystal orientations are listed in Tables 1 and 2 of Ref. 10.
  • the electro-optic axes of crystal 19 are aligned at 45° with respect to the birefringent axes of feed fiber 8.
  • the polarization directions of the orthogonal linearly polarized light waves in crystal 8 are then parallel to the electro-optic axes.
  • the waves accumulate an electro-optic phase shift proportional to the applied voltage.
  • the roundtrip phase shift is twice as large as the single pass shift.
  • the crystal belongs to one of the classes of Table 1 in Ref. 10. These crystals are free of any intrinsic birefringence.
  • a preferred material is Bi 4 (GeO 4 ) 3 (BGO).
  • birefringent crystal (Table 2) it is advantageous to use a series of two identical crystals 19a, 19b as shown in Fig. 10 .
  • the axes of birefringence (which are also the electro-optic axes) of the two crystals 19a, 19b have a 90°-offset and the longitudinal axes (a 2-fold axis for the materials of Table 2) are anti-parallel.
  • the phase shifts from the intrinsic birefringence then cancel each other while the electro-optic phase shifts add.
  • an electro-optic crystal fiber may be used instead of a bulk electro-optic crystal.
  • the collimator may be omitted in case of a crystalline single-mode fiber.
  • the electro-optic crystal could also be part of a loop mirror configuration according to Fig. 2 or, as a comparative implementation, a Sagnac configuration according to Fig. 4 .
  • the polarization directions of the returning light waves may be rotated by means of two polarization-insensitive optical circulators [11] as shown in Fig. 11 as a comparative implementation.
  • Fibers a and b are again polarization maintaining. The lengths of the various fiber segments are such that the total path difference of the two orthogonal waves is again zero.
  • Fiber b (or fiber a) may include a 90°-splice as indicated to rotate the polarizations.
  • the fibers may be attached to the circulators with axes orientations such that polarization directions of the returning waves are swapped as desired.
  • any circulator contains at least one Faraday rotator.

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Claims (14)

  1. Capteur optique de tension comprenant :
    au moins un élément de détection optique allongé (10a, lla, 19a ; 10b, 11b, 19b) capable de porter au moins un premier et un deuxième mode de lumière, lesdits modes ayant des polarisations linéaires orthogonales, un temps de propagation de phase entre lesdits deux modes dépendant d'une tension électrique à mesurer,
    une unité de commande (1) pour produire de la lumière pour lesdits deux modes dans ledit élément de détection (10a, 11a, 19a ; 10b, 11b, 19b) et pour mesurer le temps de propagation de phase subi par lesdits deux modes à cause de la biréfringence,
    et au moins un rotateur de Faraday (9) disposé entre ladite unité de commande (1) et ledit élément de détection (10a, lla, 19a ; 10b, 11b, 19b), caractérisé en ce que
    le rotateur de Faraday (9) tourne la lumière de 45° pour chaque passage,
    l'unité de commande (1) produit une première paire d'ondes lumineuses polarisées linéairement et l'envoie à l'élément de détection, qui, avec l'aide du rotateur de Faraday (9), renvoie les ondes lumineuses comme une deuxième paire d'ondes lumineuses polarisées linéairement, avec les deux ondes lumineuses étant polarisées orthogonalement et le déphasage entre les ondes lumineuses de la deuxième paire étant une fonction de la tension du champ électrique à mesurer, et
    à cause du rotateur de Faraday de 45° (9), les ondes lumineuses reviennent à l'unité de commande (1) avec des polarisations linéaires permutées.
  2. Capteur de tension selon la revendication 1, dans lequel l'unité de commande (1) comprend une source lumineuse (3), un modulateur de phase (4) pour une modulation de phase non réciproque, un détecteur de lumière (5), une unité de traitement de signaux (6), un coupleur de fibres maintenant la polarisation (7), et dans lequel l'au moins un rotateur de Faraday (9) est disposé entre ledit modulateur de phase (4) et ledit élément de détection (10a, lla, 19a ; 10b, 11b, 19b).
  3. Capteur de tension selon l'une quelconque des revendications précédentes, comprenant au moins un premier et un deuxième élément de détection (10a, lla, 19a ; 10b, 11b, 19b), lesdits éléments de détection (10a, lla, 19a ; 10b, 11b, 19b) étant disposés en série et étant couplés de façon à ce que la lumière se propageant sous ledit premier mode dans ledit premier élément de détection (10a, 11a, 19a) soit couplée dans ledit deuxième mode dans ledit deuxième élément de détection (10b, 11b, 19b) et vice versa.
  4. Capteur de tension selon la revendication 3, dans lequel ledit premier élément de détection (10a, 11a) et ledit deuxième élément de détection (10b, 11b) sont disposés côte à côte et sont montés dans une structure de support commune (17).
  5. Capteur de tension selon l'une quelconque des revendications précédentes, comprenant en outre au moins un transducteur piézoélectrique (lla, 11b), ledit élément de détection (10a ; 10b) étant monté sur ledit transducteur piézoélectrique (11a, 11b) de manière à ce qu'un changement de ladite tension produise un changement causé par contrainte de ladite biréfringence.
  6. Capteur de tension selon l'une quelconque des revendications 3 ou 4 et selon la revendication 5, comprenant au moins deux éléments transducteurs piézoélectriques (11a, 11b), dans lequel le premier élément de détection (10a) est monté sur au moins un premier desdits éléments transducteurs piézoélectriques (11a, 11b) et ledit deuxième élément de détection (10b) est monté sur au moins un deuxième desdits éléments transducteurs piézoélectriques (11a, 11b), dans lequel ledit premier et ledit deuxième élément transducteur piézoélectrique (11a, 11b) sont disposés anti-parallèlement l'un à l'autre.
  7. Capteur de tension selon l'une quelconque des revendications 5 ou 6, dans lequel ledit élément de détection (10a ; 10b) est disposé dans une gorge (16) ou dans un trou débouchant desdits éléments transducteurs piézoélectriques (11a, 11b).
  8. Capteur de tension selon l'une quelconque des revendications 5 à 7, dans lequel lesdits éléments transducteurs piézoélectriques (11a, 11b) sont en quartz.
  9. Capteur de tension selon l'une quelconque des revendications 1 à 4, dans lequel ledit élément de détection (19, 19a, 19b) est en un matériau électro-optique et change ladite biréfringence sous un champ électrique.
  10. Capteur de tension selon la revendication 3 et la revendication 9, dans lequel les axes longitudinaux dudit premier et dudit deuxième élément de détection (19a ; 19b) sont disposés anti-parallèlement l'un à l'autre.
  11. Capteur de tension selon l'une quelconque des revendications précédentes, comprenant en outre une fibre d'alimentation maintenant la polarisation (8) entre l'unité de commande (1) et ledit rotateur de Faraday (9).
  12. Capteur de tension selon l'une quelconque des revendications précédentes, dans lequel ledit élément de détection (10a, 19a ; 10b, 19b) est une fibre optique.
  13. Capteur de tension selon la revendication 12, dans lequel ledit élément de détection (10a, 19a ; 10b, 19b) est une fibre maintenant la polarisation.
  14. Capteur de tension selon la revendication 2, dans lequel deux ondes lumineuses orthogonales polarisées linéairement sortent de l'unité de commande (1) et se propagent à travers une fibre d'alimentation maintenant la polarisation (8), en particulier une fibre à coeur elliptique (8), jusqu'au rotateur de Faraday (9) avec l'angle de rotation de 45° par passage ou de 45° + k·90°, k étant un nombre entier, chaque onde lumineuse étant tournée de 45° chaque fois qu'elle passe à travers le rotateur de Faraday (9) et la rotation étant non réciproque et la rotation totale étant ainsi 90° ou 90° + k·180°, k étant un nombre entier,
    dans lequel les ondes lumineuses sortant du rotateur de Faraday (9) sont couplées dans une première fibre de détection maintenant la polarisation (10a), avec les axes rapide et lent de cette première fibre de détection (10a) étant orientés à 45° par rapport aux axes de la fibre d'alimentation maintenant la polarisation (8) de manière à ce que les directions de polarisation après la rotation coïncident de nouveau avec les axes des fibres biréfringentes,
    dans lequel une deuxième fibre de détection identique maintenant la polarisation (10b) est épissée à une épissure (12) avec ses axes tournés de 90° par rapport à la première fibre de détection (10a), de manière à ce que les ondes polarisées parallèlement à un axe lent dans la première fibre de détection (10a) sont alors polarisées le long d'un axe rapide dans la deuxième fibre de détection (10b) et vice versa,
    dans lequel les ondes sont réfléchies à l'extrémité de la deuxième fibre de détection (10b) par un miroir (15) puis rebroussent leur chemin, et
    dans lequel le rotateur de Faraday non réciproque (9) introduit une autre rotation de 45° qui s'ajoute à la première rotation et la rotation totale dans la direction en avant et en arrière est ainsi 90° de manière à ce que les ondes lumineuses retournent avec les polarisations permutées à l'unité de commande (1).
EP06817784.9A 2006-12-22 2006-12-22 Capteur optique de tension Not-in-force EP2095135B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/CH2006/000734 WO2008077255A1 (fr) 2006-12-22 2006-12-22 Capteur optique de tension

Publications (2)

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EP2095135A1 EP2095135A1 (fr) 2009-09-02
EP2095135B1 true EP2095135B1 (fr) 2015-11-04

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CA2672399A1 (fr) 2008-07-03
US7911196B2 (en) 2011-03-22
WO2008077255A1 (fr) 2008-07-03
CN101600968B (zh) 2013-01-02
US20090289617A1 (en) 2009-11-26
CN101600968A (zh) 2009-12-09
EP2095135A1 (fr) 2009-09-02

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